Tips: what format to choose for separate volumes If you start up hard drive partition to copy DVDs to hard drive or store other data, check out the output DVD file size or data size and then determine the volume size you want. Click separate volumes, enter the name and size or drag the controls to set the size you prefer, and select a format for the partitions. Step 4: Click Add icon to start to partition a hard drive on Mac without losing data. Step 3: Click Partition button on the top of the window. Internal storage drives are under the Internal section, external drives under the External section. Step 2: Select the hard drive on the left pane. Step 1: Open Finder and click Applications, open the Utilities folder and double click Disk Utility. If you can't partition your hard drive on macOS, scroll down to find some possible fixes. Follow these steps to learn how to add an additional partition using Mac built-in tool Disk Utility. Now, I bet you've made a well-informed decision. How to Partition A Hard Drive on MacBook Air/Pro/iMac with Disk Utility Partitioning doesn't make much sense if the hard drive has small capacity.It will take longer time to copy data from one partition to another.
However, this is not a big problem as storage is cheaper today. It's common that you do have free space on the hard drive, but there's no enough space left on these partitions.
Some space gets lost if you have more than one partition.
